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综合考虑了熔覆层热应力与由微锻造作用产生的应力共同作用的结果,并建立了合理的数值分析模型。利用有限元法进行计算模拟。结果表明:微锻造前,熔覆层的热应力主要表现为拉应力,这也是导致裂纹产生的主要原因;微锻造后,熔覆层的应力由拉应力转变为压应力,这样能很好地改善和消除熔覆层裂纹。模拟分析得出锻造前、后熔覆层应力分别为228.73、-775.37 MPa,与实验所测量的数据相近似,从而验证了模型的准确性。
Considering the combined effect of thermal stress of cladding layer and the stress caused by micro-forging, a reasonable numerical analysis model was established. Calculated using finite element method. The results show that the thermal stress of the cladding layer is mainly tensile stress before micro-forging, which is also the main reason leading to the crack. After micro-forging, the stress of cladding layer changes from tensile stress to compressive stress, Improve and eliminate cladding cracks. The simulation results show that the stresses of the cladding before and after forging are 228.73 and -775.37 MPa, respectively, which are similar to those measured in the experiment, which verifies the accuracy of the model.